Bently Nevada 330106-05-30-90-02-CN – 3300 XL 8 mm Reverse-Mount Probe for Space‑Limited Machinery

The 330106-05-30-90-02-CN is a Bently Nevada 3300 XL 8 mm reverse-mount proximity probe designed for tight spaces where front access isn’t practical. From my experience, this style is a go-to on compressors, turbines, and gearboxes when you need reliable shaft vibration and position measurements but only have back-side installation access through a machine case or bracket. It pairs with a 3300 XL Proximitor Sensor to deliver the standard 200 mV/mil (≈7.87 mV/µm) scale factor many plants are already calibrated to.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance; full balance prior to delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• Reverse-mount body – Installs from the back side of the mounting surface, ideal for congested or hazardous areas.
• 8 mm tip – Robust target coverage for shaft vibration/position measurements on medium to large rotors.
• 3300 XL system compatibility – Works with 3300 XL Proximitor Sensors to provide the familiar 200 mV/mil sensitivity.
• Space-efficient cable exit – The “-90” variant indicates a 90-degree connector/cable orientation that helps in tight runs.
• High temperature tolerance – Typically rated for harsh environments; probe components handle elevated temperatures common near bearings.
• Stable measurement on steel targets – Optimized for AISI 4140 (and similar) target materials used across rotating equipment.
• Rugged construction – Sealed probe design resists oil ingress; suited for long service intervals in industrial duty.
• CN variant – “-CN” suffix appears to designate a China-market compliance/marking option; electrical behavior is the same.

Technical Specifications

Brand / Model	Bently Nevada 330106-05-30-90-02-CN (3300 XL 8 mm Reverse-Mount Probe)
HS Code	9031.80 (Measuring/checking instruments, other)
Power Requirements	Passive probe; powered via 3300 XL Proximitor Sensor (no direct power to probe)
Dimensions & Weight	8 mm tip diameter; reverse-mount body; cable lengths per ordering code; weight varies with cable length (typically light, under a few hundred grams)
Operating Temperature	Probe typically -51 °C to +177 °C; proximitor module limits differ and are lower
Signal Input/Output Types	Eddy-current non-contact probe to proximitor via coax; system output (at proximitor): ~200 mV/mil (≈7.87 mV/µm) with DC gap + AC vibration
Communication Interfaces	N/A (analog transducer system)
Installation Method	Reverse-mounted through a bracket or machine case; set nominal gap to target; lock using recommended hardware and torque
Linear Range (System)	Typically ~2.0 mm (80 mils) linear measurement range with the 8 mm 3300 XL system
Connector Orientation	“-90” indicates a 90-degree cable/connector orientation for space-limited runs
Target Material	Calibrated for AISI 4140 steel (typical Bently Nevada standard)

Application Fields

You’ll typically see this probe on:

• Steam and gas turbines – Shaft vibration/position at bearings where front access is blocked by casing or lagging.
• Compressors and expanders – Reverse-mount installs on bearing housings and seal areas with poor clearance.
• Large motors and generators – Measuring shaft movement without disturbing end shields or end bells.
• Pumps and fans – Compact installs on crowded skids where routing straight exits is tough.

One thing I appreciate is how the reverse-mount body keeps the exposed hardware minimal around the probe tip, which in many cases reduces accidental contact during maintenance. A service lead at a refinery mentioned they switched to reverse-mounts on one compressor train simply to avoid cable snags—simple change, fewer nuisance faults.

Advantages & Value

• Compatibility – Aligns with existing 3300 XL systems and 3500/1900 monitoring, minimizing re-engineering.
• Measurement stability – Proven 200 mV/mil scaling simplifies setup and trending across mixed fleets.
• Space efficiency – Reverse mount and 90-degree cable routing save space and reduce strain on the cable.
• Procurement confidence – Genuine parts, documented calibration, and standard compliance for audits.
• Lifecycle cost – Durable construction helps extend service intervals and cut unscheduled probe swaps.

Installation & Maintenance

• Mounting – Use a rigid bracket or machined port; reverse-mount from the back side. Follow the recommended thread engagement and locknut torque from the OEM manual.
• Gap setting – Set the nominal probe-to-shaft gap (often around 1.0 mm for 8 mm systems) using a feeler gauge; fine-tune via proximitor DC bias.
• Wiring – Route coax away from high-voltage lines; avoid tight bends at the 90-degree exit. Maintain proper shield continuity to the proximitor.
• Environment – Install in a ventilated, dry enclosure for the proximitor electronics; probe area should be clean and free of metallic debris.
• Routine checks – Verify bias voltage, inspect cable armor/sheath, and clean the probe tip during planned outages. Firmware updates apply to monitoring modules, not the passive probe.
• Safety – De-energize associated monitoring circuits as required and lock out rotating equipment before service.

Quality & Certifications

• Manufacturer quality system: ISO 9001
• Conformity: CE marking (typical for 3300 XL transducers)
• Material compliance: RoHS/REACH (varies by option; “-CN” appears to indicate a China-market compliance/marking variant)
• Warranty: 365 days from shipment (our supply terms)

Recommended Matching Components

• Bently Nevada 3300 XL 8 mm Proximitor Sensor – Required driver that provides power to the probe and outputs DC gap plus AC vibration.
• Bently Nevada 3300 XL Extension Cable – Factory-matched cable to achieve the required 5 m, 7 m, or 9 m system length.
• Bently Nevada mounting accessories – Reverse-mount brackets, locknuts, and protective armor for high-traffic areas.

If you need us to confirm the exact cable lengths and connector orientation embedded in “330106-05-30-90-02-CN,” send the BOM or a photo of the product label. You might notice small code differences drive cable length and approvals, and it’s usually worth double-checking before we ship.